d3q Code

Some updates to kepe up with the developement version of QE, module changes, new "read_rho" interface

Dependencies updated accordingly

Bug fix: the second derivative of PZ fucntiona lwas always used, instead of the correct one.

Impact:
* if you where doing a LDA with PZ functional, no problem
* if you have been using PBE, the difference is very likely minuscule
* with any otehr functional, there is a possibility of huge difference, better repeast the D3 calculation

Name of executables now include d3_, which allows for "make install", also linking made a bit more resistant to different name of directory

Makefile got garbled because of conflicting commits, fixed

Better check

Missing deallocation

better output format

Leftover from covergence at first iteration (which never worked) could cause tk.x to fast-exit without computing anything

PGI does not like iargc to be declared intrinsic (let's hope it still works for ifort), also Makefile corrected for order of libs

Statically allocated derived types converted to dynamically allocated ones (the static ones would cause problems with PG compiler, possibly otehr random compilation errors)